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I have some questions about this charge pump:
http://img412.imageshack.us/img412/149/chargevn1.png
This should give a gate voltage to nmos switch equal to 2Vdd, but i
don't understand how does it....If i consider an input voltage equal
to 0V,inverter gives Vdd,this voltage becames left nmos gate
voltage,this charges C1 to Vdd . So, the voltage drop in C1 is equal
to Vdd, in C2 is equal to 0.This procedure is wrong because it doesn't
give the same results in figure...so how this circuit works?
Thanks
http://img412.imageshack.us/img412/149/chargevn1.png
This should give a gate voltage to nmos switch equal to 2Vdd, but i
don't understand how does it....If i consider an input voltage equal
to 0V,inverter gives Vdd,this voltage becames left nmos gate
voltage,this charges C1 to Vdd . So, the voltage drop in C1 is equal
to Vdd, in C2 is equal to 0.This procedure is wrong because it doesn't
give the same results in figure...so how this circuit works?
Thanks